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Dear Experts !I am a beginer of PID control in S7-300. I already read some document about PID control at this forum and manual for PID. I try to study PID sample (zEn01_13_Step7-temp) . I want to know why can not open almost FB in this project ? (My PC already install S7-SCL ) it shows message " this block is protected" . Do these FB have SCL code inside?Do I have to study SCL language to implement PID project?I intend design a PID project with 3 mode control correspoding 3 PID loop.mode1 - PID1 mode2- PID2mode3-PID3During process only one mode active ( other mode and other PID deactive) correspoding one PID active. Can I implement this PID project with basic PID?Please help me !Thank You Inadvance!